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The blinking sensor is the way in which the BIOS is telling you that it can't locate the Windows boot files - either the disk is defective or Windows is totally corrupted.
Reinstall and if the problem returns very quickly you will have to replace the hard disk.
That blinking cursor is the way in which the BIOS is telling you that Windows or any other OS is missing . Since you are getting it without even an hdd connected it means that the southbridge is defective. Which means that the motherboard is dead, replace it.
Now that you have installed ubuntu which is linux did you make your pc able to do dual boot. It is possible you have overwriten some important files like master boot record while doing ubuntu installation. Most times blinking cursor means no hard drive or operating system. you can try poping in XP cd and try to do recovery if you have it. Also easiest would be if you could boot into safe mode and try to fix the issue by replacing missing or corrupt files.